To develop stable and efficient silver(I) catalysts and evaluate the role of sulfur and phosphorus donor ligands in the catalytic cycloaddition of selected organic azides and alkynes (AAC), a series of mononuclear Ag(I) and heteronuclear Ag(I)-Fe(II) complexes were synthesized. The synthesis utilized phosphine and sulfur donors from the dialkyldithiophosphate and borate families, specifically Na[SH2B(mt)]. These complexes are designated as [(dppf)AgSP(S)(OPr)] (1), [SHB(mt)Ag(μ-dppf)AgSHB(mt)] (2), [(dppf)Ag(μ-dppf)Ag(dppf)] (3), and [(dppe)AgSHB(mt)] (5). The complexes 1-5 were characterized using a combination of H, C{H}, and P{H} NMR spectroscopy, as well as IR spectroscopy techniques. In two instances, single-crystal X-ray diffraction analysis was also employed. Complex 3 exhibited high catalytic activity and regioselectivity in the cycloaddition reaction conducted in water at 40 °C.
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